[FIX] Improved serialization
[REFACTOR] Moved UNSET_LABEL constant
[FEATURE] Demos can now have a description (via annotation)
[NOP]
Revert "[NOP]"

This reverts commit a56ffcbe80e4c1df0659b4427379b3c990817c2b.
[NPE]
[NOP]
[FEATURE] FontUtils provides a italic font
[FEATURE] Stylers can now merge Stylers and append a styled string to another one using a given base Styler
Merge branch 'develop' of https://github.com/bkahlert/com.bkahlert.nebula into develop
[FEATURE] Color mixing capabilities for RGB and HLS
[REFACTOR] ColorPicker now natively works with high res RGB
[FEATURE] FontUtils.merge creates a mixture out of two fonts
[NOP]
[DOC]
[API] Removed generalized Stylers.append
[FEATURE] Combine now combines Stylers in a smart fashion.

Colors are mixed and the font properties are treated independently (size, bold, italic).
[FEATURE] New ITALIC_STYLER
[FEATURE] New Stylers.rebase styles a StyledString as if its original style was the given and not the system's one.
[DEMO] Updated Styler demo